Gear-grinder



E. J. LEE S.

GEAR GRINDER.

APPLl-CATION FILED SEPT. 2, I919.

Patented Sept. 8, 1921.

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Patented fieph 6, 192 L Inked??? E. J. LEES.

GEAR GRINDER.

APPLICATION FILED SEPTFZ, 1919.

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ERA 57 d life E. l. LEES.

GEAR GRINDER.

APPLICATION FILED SEPT. 2, I919.

Patented $ept. 6., 1921.

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H "ma ERNEST I. LEES; 01E CLEVELAND, OHIO, ASSIGNOR TO HOSEA- LAND,

QHIO...

4 G G-BINDER.

readies.

To all whom it may concern: i

Be it known that. I, ERNEST J. Lnns, a citizen of the United States ofAmerica, residing at 3098 Berkshire rd., in the city of Cleveland andState of Ohio, have invented -a new and useful Improvement in Gear-Grinders, of'which the following is a specification, the principle ofthe invention being herein explained and the best modein which I havecontemplated applying that principle, so as to distinguish it from otherinventions.

machine of the c aracter stated which besides being strong and compactwill present the following advantages; 7

1. Translating the power applied from a rotating part to a slide whichcarries it so as to efiect a compound movement.

"2. Provision of an abrading wheel of sufi- I cientlylarge diameter tocover the entire working time from side to side of the gear to beground. I

versely wound about the axis of the work.

spindle for transferring the turning move- -Inent of the latter.intdbodily-movement of the same along a straight line; together with a.-XXI of Fig. XX looking. down-:-

means for adjusting the tension in such flexible members. Q Themachineembodying my invention is to grind gears of the involute systemsuch that all gears so ground comprehend the 'base theory of .theinvolute rack system,

there being a relative rolling action of the generating scheme so that,all gears of tlieF' same pressure angle will be interchangeableregardless'of the numberof teeth.

Adverting to the drawings Figure I is a front elevation of a machineembodying my invention.

II is a right side elevation of the same. I Fig. III is a top planyi-ewof the machine.

Specification of {letters Patent. Patented Selma-t5, 1921i. Applicationfiled September 2.1919. Serial n 321,010. r

Fig. IV is a left side e'levation.

Fig. V is a vertical crow section online V'-V of Fig. IV lookingre'arwardly.

Fig. VI is a vertical cross section online VI-VI of Fig. IV lookingforwardly.

of Figs. III and V looking in the direction of the indicating arrows. IFig. VIII is. an enlargedfvertical section on line VIII- VIII of Fig;III looking toward the right side of the machine.

Figs. IX and X are end and front viewsof elements of the indexingmechanism.

Fig. -XI is a 'vertical section on line XI--X-I of Fig. V looking to theright. Fig. XII is a vertical section on line XII-XII of Fig. V likewiselooking to the: I

right. 7 ig. XIII is ahorizontal section on line XIII- XIII of Fig. XIIlooking downwardly'.

Fig. XIV is anenlarged vertical section on line XIV-XIVof Fig. Vv alsolooking tothe 1 f right. i g

Fig. XV is I fragmentary elevation, of parts shown at one end in Fig.XIV.

'Fig. XVI is asection on line XVI-Xvi of Fig. V looking downwardly. Fig.XVII is aseetion on line XVII- XVII of Fig. IV. I

Fig. XVIII is an enlargedwertical section on line XVIII-XVIII'ot Fig. Ilooking.

to the riht. 1 i

Fi X is a-horizontal section on line XI -.XIX of Fig. XVIII.

Fig. XX is an enlarged section on' zi zajg r. teammate-mam MI Fig. VIIis a vertical longitudinal section (from front to rear) taken on lineVII-VII line XXXX'of Fig. I looking to the rlght.

L Fi XXI is a horizontal section onlin'e Fig. XXIV "is, an enlargedsectionon ahra/ding and associated elements,'- partly in section" on theline XXVI-.-X-XVI of XXVIII.

v igxxvnr is a fragmentary seamen view through parts'shown in Fig. XXVI.ite

Fig. is afra entary'view of the parts shown inFig. XXVIIIXXVIII.

XVII en fthe line Fig. XXIX is a fragmentary tape segment'and supportinarm taken on line XXIX-XXIX of Fig. II. Fig. XXX is a fragmenta viewlooking downwardly on line XI&- XXX of Ig.IXXXI a sectional view: online XX of Fig. XIII.

Abr ading wheel mounting and drive.

The frame or bed 1 of the machine carries at its rear end an up-rightextension fashioned with guide ways 2 to enable the adjustmentvertically therealong of a slide 3, such adjustment being accomplishedin the usual manner by means of a screw 4 operatively connected to theslide and controlledby customary mechanism best seen in Fig. I. Thescrew 4 moves axially through it I when a bevel gear 5 thereon is turnedby a bevel pinion 6 which is mounted on a shaft 7 on the end of which isa'hand wheel 8. Such up and down adjustment of the tool b carrying slideis required for the various diameters of gears to be ground.- -I haveprovided for an additional adjustment of the abrading wheel along anarcuate path so as to set it at thevarious angles which are proper forgears of various pressure angles. Accordingly, a tool carrying head 9 isswiveled in any approved manner upon the slide 3 and is adapted to beturned in a manner common to the art, for example, by means of a wormwheel 10 secured to the head and turned by a worm 11 as shown in Figs.II and VI. On-the end of the worm shaft 12, a crank handle may beapplied for -:the purpose just stated.

' view in Fig.

the pulley 16, over another pulley 19, around a fast, pulley 20 andthence back to'the counter sh'aftabove. The pulley 20 is mounted on amain drivesh'aft 21 shown in Figs.

VI- and VII from which power is communi cated, as will hereinafterappear, to other 'movable parts of the machine.

- The spindle 15 projects. beyond the' bear-v -i'ng end 14 and carriesapair of disk flanges 22 and23 adapted by means of'a nut 24 on theendofthe spindle to clamp against'oppo site sides of an abrading wheel 25'as is illustrated in Fig. II. .The wheel 25 will be seen to be oflargediameter sufiiciently so'to extend across the entire face of thegear G 'to be ground and it is to be particularly noticed that itscutting face 26' is disposed bevondthe end 14 of the bearing, that is tosection .of

say, nearer to the pulley 16. .;In' other words, the end 14of thebearing intersects the plane of the cutting face of thetool, whereby toreduce the tendency to "whipping action and in consequence miniziizevibration. A guard 27 preferably incldsSthe major portion of the wheel25.

Directing attention to Figs. XXVI, XXVII and XXVIII it will be seen thatthe rear of the head 9 carries a bracket 28 provided with a radial slot29 in registry with a corresponding slot in the rear face of the guard Ahandled stem 30 provided on its inner end witha diamond 31 is mountedfor adjustment bot-h along the slots 29 and in and out in relativelyperpendicular direction.

Its in and out position may be fixed by means of aset screw 32 so that,as occasion may require, the diamond point 31 may be caused to engagethe cutting face of the wheel 25 and by movement lengthwise of the slots29 serve. to true-up the cutting face of the wheel.

. Work spindle rolling.

According to the exemplification of the drawings the gear blank Gflis tobe given the rolling movement required in carryingout the generatingprinciple. To accomplish such rollin .movement I employ mechanismincluding exible tapes adapted to wind and unwind about a segment havingthe same diameter as the pitch diameter of the gear to. be ground. I amaware that such an employment of tapes is not in itself new, but insteadof employing them as heretofore I reverse the manner in which thev areutilized to translate power. Instead of actuating a slide and causingthe power thus applied to turn a spindle in one direction through themedium tapes (or reciprocating a slide to 105 successively turn aspindle in opposite direcmovement on the part of the slide and therebyrealize the following noteworthy advan- 1 tage. Ifthe slide actuation isthe initiating power it must be accomplished byeither a rack and pinionora screw, or a bell-crank lever, or a piston arrangement or, in anyevent, some mechanical connection certain to involve back-lash andresultant lost motion with its attendant inaccuracy. Moreover, anymechanism required to reciprocate a slide inevitably involves alternateimpacts and in consequence vibration or tremble. My reversal of themanner of employing tapes eliminates thepossibility of error be- .-causethe action isalways positive, certain and smooth owing to having onlyone direct applied power for both components of the required rollingmovement. p Q Mounted on the front end of the main driving shaft 21 asappears in Figs. I and XX is a gear 33 which is the first unitof changegearing appearing in dotted lines in 130 Fig. I and further shownenlarged either drives a gear 37 'conn'ectedby means of a' reversingclutch R. C. with a shaft 38 which latter drives another gear39 andthence through an idler 40 drivesa gear 41 which is loose upon a sleeve42. The gear 41 is adapted to have jaw tooth connection with a clutchmember 43 which is rotatably interlocked, but slidably connected with arod 44, which passes through the sleeve 42, by

means of a pin 45 inserted through a suitably elonjgated slot 46 as isclearly shown in Fig. XI The rod'44 is movable in an axial. directionthrough the sleeve 42 and such' movement may be accomplished bymanipulation of a knob 47 on its outer end, whereby the clutch member 43may be thrown into or moved out of engagement with the gear 41 so as tomake or break the rotatable connection of the latter with the sleeve 42.Mounted on the outer end of the sleeve 42 is a hand wheel 48 adapted tobe rotatably connected with a clutch member 49 which is keyed to thesleeve 42. The action of a spring 50 must be overcome in order toaccomplish such clutch action. As will be readily understood when it isdesired to drive the sleeve 42 by power the knob 47 is pulled out so asto effect the clutching engagement of the member 43- with the gear 41.If, on the other and, it is desired to effect the rotation of th sleeve42 by hand the knob 47 is pushed in and likewise the hand wheel 48 andthereafter the latter may be caused to rotate the sleeve 42 at will. i j

Directing attention to Figs. V and VII, it will be seen in the latterthat the sleeve 42 is in splined connection with a worm shaft carrying aworm 51 which meshes with-a worm wheel segment 52 which is carried,

as shown .in Fig. V, by a disk 53 "which is mounted upon a work spindle54, carrying an arbor and gear and the whole carried by a slide S. Inconsequence, when the disk 53 is oscillated everything carried therebyand particularly the indexing mechanism to be later described will becorrespondingly moved.v Extending upwardly from a forwardly extendedsleeve of the disk 53 is a bracket 55 alongwhich a smooth segment 56'may be secured for adjustment radially of the axis of the spindle 54 assuggested by the cap screws in Figs. VII and VIII, in order to besuitably located for gear blanks of various diameter. At its ends thesegment 56 is provided with clamping attachments 57 and 58 adapted tosecure two ends of a pair of steel ta es 59 and 60 which pass alongsidecachet er in opposite directions around the segment and which have theirother ends adjustably attached at 61 The bracket 63 may be fixed invarious positions by means of a cap screw 65, the construction enablingsuch adjustment being better shown in Fig. XXIX just above Fig. VIII. Itis desirable that the relativel movable surfaces-of the brackets 55 and(3 3 and the segment 56'and fixture 64, respectively, be accuratelyfitted so that the whole when secured in some particular positionpermits of a firm and steady action when subjected to'the pull of thetapes.-

As has been already stated the abra'ding wheel 25 is of large enoughdiameter to cover the entire working face from side to side, of eachtooth of the gear G to be ground and of course the clearance at theroots of the gear teeth will permit the periphery of the wheel 25 toenter deep enough; It 15 to be understood moreower, that each tooth faceof the gear is to be ground twice, before indexing first during therolling movement of the blank G in one direction and thereafter duringthe rolling movement of the blank in the opposite direction. It may notbe amiss to state at this point that the relative mov'ementbodily of oneof theengageable parts toward the other need not necessarily beefi'ected by the straight line move? ment of therblank shown by way ofexam-.

of the b-lank'the latter must be indexed in order to bring the nextalternate tooth face into pro-per position.

Reoersmg mechanism.

Carried outwardly beyond the plane on which Fig. VII is a section, so asto be moved along with the disk 53 is a spur gear segment 66 shown inFigs. IV and V. Such segment engages the teeth of a rack 67 from whichtwo pins 68 project laterally so that during their reciprocal movementfirst one and then the other engages a verti- 'cal member 69 clamped ona horizontal rod 70 as shown in Figs. IV, V and VII. The upwardlyprojecting member 69 is shown in detail in Figs. IX and X togetherWltl'lf another laterally; and upwardly projected member 71. It is fromthe movement of the latter that the indexing mechanism receivesits'actuation in a manner to be subse uently described. J i

n observation of Figs. XVIII, XX and XXI will show how the automaticactuation of the clutch RC may be accomplished.

The shaft35 carries another gear 72 adapted to mesh with an idler 73which in turn drives a gear 7 4 adapted to have a 'clutchin engagementwith the clutch member R on the side opposite to that from which the 87.When therefore, the reciprocation of the rack 67 is communicated toreciprocation of the rod 70, the provision of a comnion type of load andfire mechanism will serve to shift the clutch member BC in the followingmanner. Inasmuch as nothing is claimed for such mechanism. it will beVery briefly described.

Secured upon a shifter rod 75 also shown in Fig. XXI is a shifter arm 76adapted to have forked connection with the clutch member RC. Alsosecured upon therod 75 is a collar 77. Springs 78 and 79 are interposedbetween the arm 76 and collar 77 and an interjacent pair of collars 80and 81. Secured upon the rod 7 O is a depending arm 82 one end of whichis interposed between the collars 80 and 81 so that its move ment alongwith the rod 70' compresses either the spring 78 or the spring 79depending upon the direction in which it is moved. The arm 82 carries adog 83 adapted to lift a pawl 84 after a given degree of compression ofthe spring 79 whereupon the collar 77 is released and the rod 75suddenly shifted so that the gear 74 is engaged by the clutch BC. Therod 70 carries another depending arm provided with an opposltelydirected dog 85 which acts to similarly lift another pawl 86 whereby theoperation may be repeated after the reverse movement of the rod 70 hascontinued fo a certain distance. It will thus be clear that oscillationconcentric with the axis of the work spindle 54, the arbor therein andthe gear G carried by the latter acts to draw the slide S back and forthas translated through the agency.

of the tapes 59 and 60.

' [Meaning mechanism.

next tooth into position is accomplished automatically. The principle ofthe operation of the indexing mechanism is not new nor will anything beclaimed herein for the specific structuref Accordingly, the indexingmechanism may also be tersely described.

The second up-right member 71 shown in Figs. I, IV, VII, IX, X, and XVIwhich is reciprocable with the shaft carries '3.

latch 88 is pivotally suspended. This latch 'has a tapered under surfaceadapted to engage the tapered upper end 89 of a I rack plunger 90, seeFig. XII. According to the position of the parts as appearing in Fig.VII the latch 88'is being carried to the left and is itself supportedupon the arm 87 so that it will firmly engage the surface 89 causing therack 90 to move downwardly.

On its return the latch 88 is enabled to swing upwardly and ride overthe extremity 89. As the rack 90 moves downwardly it turns a gear 91 onone end of a short shaft 1 92 which in turn rotates another gear 93mounted on! the .other end thereof. The gear 93 acts to move anotherrack 94 upwardly and in consequence a plate 95 carextremity. As appearsin Fig. IV the plate 95 simultaneously engages the under surfaces of apair of arcuate bars 96. These arcuate bars may also be seen-in Fig. Vand enlarged in Figs. XXII and XXIV to which attention should now bedirected. Both of the bars 96 are secured at 97 and ried upon its upperoutwardly projecting are capable of yielding upwardly between guides 98.An eye 99 is mounted between the two bars and carries a pin 100 withwhich ,a turnbuckle 101 articulates. Connected with the turnbuckle is arack 102 the teeth of which engage a long faced pinion 103 on a shortshaft 103 and the teeth. on the opposite side of the gear 103 engagewith a pair of racks 104 and 105 (see Fig. XXII) to move the sametogether downwardly against the action of a return spring 106 which issupported upon a fixture 107. Before continuing the description of theparts which will cooperate with the rack 104 for the purpose of keepingthe power for indexing applied long enough to turn in the gear G theproper amount, the source and train of mechanism for efiecting theindexing by power will be explained.

Looking at Fig. VII a pinion 108 will be seen mounted upon the shaft21'from which power is communicated to a gear 109 (see Fig. XVII) thencealong a short horizontal shaft to a bevel pinion 110, to a bevelpinhorizontal shaft 116 on the other end of.

which is a pinion 117. The pinion 117 drives a bevel gear 118 mounted ona shaft 119 as clearly appears in Fig. XXII. It is to be understoodtherefore that the shaft 119 is constantly rotating.

The rack 102 extends upwardl a considerable distance as shown in Fig.XIII and carries in spaced relationa pair of brackets moves a shifterfork 125 which articulates 1,890,145 v a I 120 and 121 the free ends ofwhich carry adjustable set screws 122 and 123, respectively, as shown inFig. XXIV. The opposedsurfaces of the set screws are spaced apart agreater distance than the thickness of the end of a rocker arm 124 whichis interposed therebetwe'en so as to be alternatively engagedthereby.The Min 124 1o\" with and may slide a clutch member 126 having jaw teeth127. These teeth are adapted to engage complementary clutch teeth on aclutch member 128 which is keyed to.

attached to receive the upper extremity of the rack 104 with asubstantially accurate fit as" appears in Fig. XXIII. The loose disk 131which is behind the disk 130 as viewed in the figure just mentioned isfashioned with a larger peripheral recess 133 adapted to be occupied bythe upper extremity of the rack 105. Such lar er recess appears indotted lines inFig. X III. ,When the clutch connection is made betweenthe shafts 119 and 129 the disk 130 will of course be rotated, providedthe rack 104 has been withdrawn from its obstructing position as shownin Fig. XXIII. The shaft 129 drives a gear 134 which meshes with a gear135 by means of which a gear 136 on the same shaft is driven and suchgear in turn drives a gear 137 which is secured to the loose disk 131.The ratio of the gearing just described is one of reduction so that thedisk 131 will rotate exactly one third as fast as the disk 130 for apurpose to be hereinafter vexplained; Upon the extremity of the shaft129 is a gear 138 constituting the first unit of change caring tocontrol the speed but not the limit of the indexing movement of the gearblank G. Thegear 138 drivesa gear 139 and therefore also a gear 140 bothof which are fixedly mounted on the same bushing. The gears 138,139

and 140are shown in Figs.- I, IV, and XXII.

The gear 140 meshes with a gear 141 shown in Fig. XIV and such gear inturn drives one unit 142 of a clutch device. The teeth 7 143 of suchdevice are preferably fine, as

shown in Fig. XVQin order to permit of a delicate adjustment in theman-ner'to be presently described. A spring 144 is interposed so as totend normally to move the other unit'145 of the clutch device alon theshaft 146, onwhich both are mounte in a direction away from the unit142. On the side of the ear 141 opposite to that where the clutch eviceis located the shaft 146 carries aworm 14 7 adapted to t'urnfamany'toothedworm wheel 148. This last mentioned,

connection is shown in Figs. V and XIV. The worm .wheel'148 is mountedon the rear end of the work spindle 5 4, in consequence of which itsturning movement may be communicated thereto. The provision of a largenumber of teeth in the worm wheel 148 further assists in enablingpressure adjust- -mentby hand as will now be explained.

As is well known it is important to have not onl an accurate initial setup for the work piece, but to be able to 'efiect a nice compensation forwear. Ite-directing attention to Fig. XIV it will be seen that a nut 149is in screw threaded connection near the outer end of the shaft 146 andis adapted when turned up to move in the unit 145 to overcome the actionof the spring 144 and thus maintain the clutching engagement. The,outerextremity 150 of the shaft 146 is shown squared to enableit to beturned, and'in consequence theworm wheel 148 and work spindle, by theapplication of a crank handle been su' ciently unscrewed to permit thespring 144 to disengage the clutch teeth.

In orderto preclude the possibility of strolling movement of the gearGbefore the indexing operation is complete, I provide a s'afety devicewhich automatically obstructs the oiperation of the reverslng mechanismunt the indexing movement is concluded. If thereader will look at notshown) after the nut 149 has Figs. VII, XXXI and XIII, he will observethat the rod 7 5 carries a collar 151 fixed to it and rovided with apro'ection 152 best seen in igs. XIII and XX 1. In Figs. XII and XIII itmay also be see that the rack plunger carries a forwardly extended car153 which intersects the path of movement of the projection 152.

Operation.

After th "ear G has been mounted as appears in 1g. V and the adjustmentsof the brackets 55 and 63 have been made according to the diameter ofthe gear G, the wheel 25 has been doubly adjusted with considerationbothof the diameter and of the pressure angle thereof and the gear G hasbeen turned to proper position throu h the medium of the shaft 146; thetig t ulleys 16 and 20 may be set in motion.

he rotation of the pulley 20 transmits power along the shaft 21 throughthe change gear units 33 and 39 so as to drive the sleeve 42 andoscillate the worm. wheel 52 and se ent 56. When such segment is turnedin one direction one of the tapes pulls the main slide S in onedirectlon toward that end of the bracket 63 to which the particular ta eis attached. It 1s'ev1- dent therefore t at power applied as a turningmovement about the axis of the work spindle 54 is translated intosmoothand ---firim travel of the mam support ng slide. The translatingaction is moreover positive and substantially noiseless and isparticularly advantageous owing to the fact that no back-lash andtherefore lost motion can attend the reversing action of the mechanismemploying the tapes after her 125 is so timed that the shaft 119-willthe manner of my invention.-

- The rolling movement of the work spindle and other parts notably thegear segment 66 causes a reciprocation of the rack 67 which is adaptedto alternately actuate the indexing mechanism. In the meantime thereciprocation of the rod 70 in unison with the movement of the verticalmember 69-when it is engaged and moved by one of the pins 68 on therack, actuates the reversing mechanism including the reversing clutchBO, As the reversing mechanism reaches a certain stage of its action,

the rod 70 carrying the upright member 71 causes the actuation of theindexing mechanism in its entirety by depressing the plunger rack 90raising the rack 94 together with-the plate 95 at the top thereof, thusspringing the arcuate bars 96 upwardl to carry the rack 102 up andthere- 'fore t e rack 104 down. Presently the tops of the racks 104 and105- are withdrawn from their recesses 132 and 133 respectively, and theoperation of the clutch mem-- commence to'drive the shaft 129 andtherefore to rotate the" two disks 130 and 131 as soon as the withdrawalof the racks 104 and 105 permits. Such timing is enabled by reason oftheadjustable spacing of the i look screws 122 and 123 whereby an intervalof time elapses sufficient to allow the withdrawal of the racks 104 and.105 beyond the lower peripheries of the disks 130 and 131 before theclutch 125 is thrown in.

In order to make. the drive smoother and to lend accuracy the disk 131is rotated only one third as rapidly as-the disk 130. In-

asmuch as the racks 104 and 105 are secured to each other and thereforemust move upwardly in unison, when the recess 132 again comes intoposition over the top of the rack 105 the recess 133 will have beencarried only one third of'theway around. In consequence, the rack 104 isnot yet permitted to move upwardly and therefore the. rack 105 islikewise still being held down by the rack- 104. Not, until the disk 131reaches the end of its third revolution will the recesses 132 and 133again register and fore the reversing mechanism which is actuated by themovement of the rod 75 cannot functionate until the extremities of the.racks 104 and 105 again occupyl their recesses 132 and 133 to stop .theindexing mechanism. It will thus be apparent that the actuation of thereversing mechanism is subject to the completion of the automaticindexing operation. If it is desired to index independently of thereversing mechanism this can be done by lifting the handle 154 (which.is fixedly secured to the shaft 103) upwardly. This movement disengagesthe upper ends of the racks 104 and 105 from the disks and causes theclutch 126 to engage clutch .123 and thus rotate or index the gear G aswill be readily understood.

1. In apparatus of the class described, the combination of a frame, aslide movable thereon, a spindle rotatably mounted upon said slide,means for rotating said; spindle, a segment arranged to rotate with saidspindle, and flexible means connecting said frame and segment andadapted to elfect the bodily movement of said spindle.

2. In apparatus of the class described, the

combination of a frame, a slide movable thereon, a spindle rotatablymounted upon said slide, means for rotating said spindle, a segmentarranged to rotate with said spindle, and means including a tapestretched between said segment and frame and adapted to translate theapplied power into movement of said slide.

3. In apparatus of the class described, the combination of a frame, aslide movable thereon, a spindle rotatably mounted upon said slide,means for rotating said spindle in .opposite directions, a segmentarranged to rotate with said spindle, and a pair of flexible membersattached to said frame and to said segment and adapted to translate thereversed ciprocation of said slide.

4. A gear generating machine comprising,

'a frame, a rotatably mounted work piece, a

rotatably mounted tool, a slide movable upon said frame and supportingone of said engageable parts, means for rotating said parts, andconnections between said slide supported rotatable part and framewhereby the applied power is converted into slide actuation.

5. A gear generating grinder comprising, a frameya rotatably mountedblank, a rotary. tool, a slide movable upon said frame and supportingsaid blank, means for rotat-- ing said blank in reversed directions, anda connection between said blank and frame including a pair of membersone adapted to be wound about the other, whereby the rotation ofsaidblank is converted into slide actuation a d both components of thederotations of said spindle into re- 110 rea ies sired reversed rollingmovement of the i blank may be realized without back-lash or a frame, arotatably mounted element to be ground, a rotary tool element, a slidemov the impact and resultant vibration consequent thereto.

6. A gear generating grinder comprlsmg able .upon saidframe andsupporting one of said elements, separate means for rotating saidelements, and an adjustable connection between said slide supportedelement and frame including a pair of members,

one adapted to be wound about the other in an arc of the same diameteras the pitch diameter of the element tobe ground,'whereby the rotationofthe slide supported element servesto actuate said slide.

7. A gear generating grinder comprising a frame, a rotary work spindle,a rotary tool, a slide movable upon said frame and supporting one ofsaid rotary parts, and means between said frame and slide sup-portedpart, having tangential connection with the latter, for translating therotational movement of said part into slide actuation.

8. A gear generating grinder comprising a frame, a rotary work spindle,a rotary'too a slide movable upon said frame and supporting onevof saidrotaryparts, means for rotating said slide supported part oppositedirections, and means connectlng sald frame andslide supported partincluding flexible members secured to said frame at points on oppositesides of said slide sup rted partand adapted to be wound about thelatter, whereby to successively draw said spindle toward its points ofconnection with said frame.

9. A gear generating grinder comprising 4a a frame, a rotary workspindle, a rotary tool,' a slide movable upon said frame and supportingone of said rotary parts, means for rotating said slide supported part,and

means connecting said frame and slide sup:

ported'part including a flexible member secured to said frame andadaptedtobe wound about the axis of said slide supported part, wherebyto draw said slide supported part toward its point of connection withsaid frame.

10. A machine of the character described comprising a frame, a pair ofslides movable upon said frame in relatively transverse direction's, agear rotatably mounted upon'one of said. slideswith its axis at rightangles to the line of movement of said slide, a support movably' mountedupon the other of said slide s a tool mounted on said support, means foradjusting the position said tool supporting side, means for. adjustingsaid support, and winding andunwin'ding means for translating therotational movement of said gear into reciprocating movement of sad gearsupporting slide.

11 A machine of the character described 'anda comprisinga frame, a toolmounted thereon,

a slide mounted upon said frame, a gear rotatably mounted on said slide,means for oscillating said gear in opposite directions, and a windingand unwinding appliance for translating the rotational movement of said7 gear into reciprocation of said slide. v I

12. A machine of the character described comprising'a frame, a toolrotatably mounted thereon, a slide mounted upon said frame,

a structure provided with a segment of corresponding diameter as thepitch diameter of-the gear to be ground and rotatably mounted on saidslide, means for rotatin said structure, a gear supported by saidstructure, and means including a tape wound about said segment fortranslating the rotational movement thereof into 'traversing movement ofsaid slide, whereby to roll the gear relative to said tool.

13. A machine of the character described comprising a frame, a toolrotatably mounted thereon, a slide mounted upon saidframe, a structurerotatably mounted on said slide and provided with a segment, means forturning said-structure, a gear supported by said structure, and meansincluding a pair of tapes each secured to said frame and to said segmentfor translating said turning inodyement into reciprocal movement of saidS 1 61 c 14. A machine of the character described comprising a frame, asupport adjustably mounted upon said frame, a tool rotatably mounted onsaid support, a slide movably mounted upon said frame, a spindlerotatably mounted upon said slide, a segment being the same as the pitchdiameter of said "gear, tapes wound about said segment and limit ear tobe ground each connected to said spindle, the diameter of said segmentconnected to said frame, and means for turning said spindle in reverseddirections to pull upon the ends of said tapes and reciprocate said gearbodily.

15. A machine of'the character described comprising a frame, a slidemounted thereon,

a support adjustably mounted upon said.

slide, a tool mounted on said support, another slide movably. mountedupon said frame, a spindle rotatably-mounted upon frame wherebysimultaneously'to move said spindle bodily, said wheel having anabrading face in a plane intersecting said bearing whereby to avoidawhipping action.

17. A ear generating grinder comprising the combination of a frame, awork spindle,

a rotatably mounted tool, a slide supporting oneof said rotatableelements, and means ineluding a member operatively wound about the'axisof and connected to said slide supported element, whereby the rotationof the latter reciprocates saidslide.

18; A machine of the character described comprising the combination of aframe, a ro-' tatable work spindle, a rotary tool, a slide movable uponsaid frame, a head adjustably mounted upon said slide and'carrymg saidtool, another slide'movable upon said frame and supporting said spindle,means for,

driving said tool, means for adjusting the position of said tool slide,means for impart ing rotational movement to said spindle, and means fortranslating such movement of the latter into travel of said work slide.

19. A machineof the character described comprising a frame, a rotatablework spindle, a gear thereon, a rotary tool, a slide adapted to. travelon said frame and supporting one of said movable parts, means dle, agear thereon, a tool spindle, a s idev adapted to travel on said frameand supporting one of said spindles, means for turning said slidesupported spindle, a segment carried by said slide supported spindle andof the same diameter as, the pitch diameter of the gear to be operatedupon, a flexible member connecting said frame and segment, whereby theslide travels when the slide supported spindle turns, and means foradjusting the connection of said member with said;

frame or segment. p

21."A machine of the character; described comprising a frame, arotatable work spirit dle, a gear thereon, a rotary tool, a slideadapted to travel on said frame and supporting one of said .movableparts, means for turning said'spindle, a segment adjustably carried bysaid spindle and of the same diameter. as the pitch diameter of the gearto' beoperated upon, means for radially adjusting the position of saidsegmentv upon said spindle, flexible members cennectin different pointson said frame with sai se ent, whereby the slide travelswhen the spindleturns, and-means for adjustin both frame.

connections, of said members with said.

' 22. A gear grinding machine. comprising the combination of, a" frame,rotatably mounted work and tool spindles, a slide movable thereon andsupporting one of said spindles, agear and a tool secured to saidspindles, ;-;respedtively, means for turning.

said spindles, a" segment mounted to turn with said: slidemounted'spindle, and means operated by one of said turning movements foreffecting a distinct relative movement between said spindles including amember having a tangential relation to the periphery of said segment,23. A ear grinding machine comprising the combination'of a frame, aslide movable thereon, awork spindle rotatably mounted on,said slide, atool rotatably mounted on said frame, means forturningsaid work spindlethrough a given arc, a segment" mounted to turn with said work spindle,

a flexible tape secured-to the periphery of said segment andto saidframe, means for adjusting the effective length of said tape,

and means for rotating said tool..- 24. A gear grinding machine;comprising the combination of a frame, a tool mounted-v thereon, a'slidemovable on said frame, a

work spindle rotatably mounted on said slide, a sleeve upon' saidspindle, means for driving said sleeve in reversed directions,

mechanism including a segment and tapes for translating said reverseddirections into reciprocating movement of said slide, and indexingmechanism interposed between said sleeve and spindle-for causin movementof said spindle relative to sai sleeve.

25. A gear grinding machine comprising the combination of a frame, aslide movable thereon, a work spindle 'movably mounted 7 upon saidslide, a gear mounted to turnabout the axis of said spindle, means foractuating said spindle, means including flexible members fortranslatingsuch actuation into reciprocation of said slide, a wheel having a flatcutting face and adjustably mounted on said frame to the pressure angleof the gear-teeth to be cut, and means for rotating said wheel, thearrangementbeing such that a rolling" generating contact: is had betweenthe gear teeth and wheel. j

26. A gear generating grinder comprising a frame, a rotatably means foreffecting the turning-movement mounted work spindle 1 of said spindle, atool, a support for said spindle meivably mountedup'on' said frame, andmeans includinga member tangent ally connected with relation to theaxis'of. saig I 152 said .sp'indle into slide move nenti iof spindle fortranslating the movement 0 sup "ort. 2%...

comprising the combination of a firame,--. a

workspindle rotatably mounted thereon, a"

A machine the character described said slide.

rotary tool having a planul-ar cutting face, a reciprocable slidesupporting one of said engageable rotatable parts, means for rotatingthe slide supported part, and means including a pair of members eachoperativelyoconnected with said frame and said slide supported part intangential relation to a segment turning on the same axis as such partfor efiecting the reversed movements of said slide.

28. A machine of the character described comprising the combination of aframe, a

slide movable on said frame, a rotatable work spindle structure carriedby said slide and having its axis at right angles to the direction ofmovement of said slide, a tool, means for imparting rotational movementto said structure, the latter including an arcuate part and a membercoacting therewith and connecte with said frame for translat-. ing therotatable movement of said structure into slide-actuation.

29. A machine of the character described comprising a frame, a slidemovable upon said frame, a spindle rotatably mounted upon said slide soas to be capable of turning-movement about an axis at right angles tothe line of movement of said slide, a tool mounted on said frame, meansfor turningsaid spindle, and means actuated by said turning movement andadapted to move 30. A machine of the character described comprising thecombination of a frame, a slide movable on said frame, a work spindlemounted for turning movement on said slide, a tool, means for turningsaid work spindle, and means actuated by said work spindle for movingsaid slide at a rate equal to the pitch circumference of the worktranslated into linear travel.

tween said spindles at right angles to the axis of said turning movementfrom which power for said distinct relative movement is derived. i 32.In a machine of the character described the combination of a frame, aslide movable thereon, a spindle mounted for turningmovement upon saidslide, means for turning said spindle in opposite directions, and awinding and unwinding connection between said frame and spindle adaptedto efiect the reciprocation of said slide.

33. A machine of the character described comprising a frame, a slidemovably mounted on said frame, a spindle rotatably mounted on saidslide, a work piece carried by said spindle, means for turning saidspindle in opposite directions, and means operated by said spindle forreciprocating said slide.

34. A machine of the character described comprising relatively movablesupports, a work spindle carried by one of said supports, flexibleconnections between said spindle and the othersupport and connected tothe latter at opposite sides of said spindle, and means for rotatingsaid spindle in opposite directions, whereby said connections are woundon and unwound from said spindle and the rotational movements thereofare translated into reciprocatory- ERNEST J. LEES.

